Design And Implementation Of Wireless LoRa In Transmission Line Monitoring

Traditional high-voltage transmission lines always use human inspection line. It lead to massive manpower and material resources invested, besides it usually obtain completeness and timeliness because of difficult inspection and long time. The development of internet of things technologies and wireless ad hoc network technology, provides a new technical solutions for the field of high-voltage transmission line online monitoring system. It can realize the precise monitoring of the environmental status of the transmission line. Nowadays, the on-line monitoring system can not only actualize the on-line monitoring device for the power lines monitor conventionally, but also monitor the operating status of the on-line monitoring equipment itself. Therefore, this system uses LoRa (Long Range) technology and wireless ad hoc network technology to carry out the application research of on-line monitoring of transmission lines. This system is based on the existing high-voltage transmission line online monitoring 5.8G wireless private network communication system, using LoRa technology,multi-hop self-organizing network and GPRS communication technology to achieve high-voltage transmission line’s real-time monitoring, data transmission, monitoring equipment management and control .To ensure the reliable and stable operation of transmission lines.The main work of this paper includes the follow contents:(1)According to the development requirements of the transmission line online monitoring system, An embedded hardware and software development platform based on STM8L151G4,SX1278 and STM32F103VET6 is designed.(2) Analyzed the system communication network scheme, Contiki operating system and Rime protocol stack, implemented a transmission line on-line monitoring and management system based on wireless LoRa technology. The system uses the LoRa and Rime protocols to compose the communication network structure of the gateway center node and collect slave node, as well as take advantage of GPRS to complete the gateway node and the server communication. That realized the data of the monitoring terminal node is sent to the gateway node through the star network or Mesh network, and then the data is sent to the monitoring management center through GPRS by the gateway node .Which solves the problem of data wireless network transmission and monitoring terminal node remote monitoring.(3) The wireless data message format, SX1278 program design, the bottom RF drive and system application program design based on Rime protocol stack are designed minutely in software System. Finally, the system is tested and analyzed, including LoRa long distance communication test, Cooja simulation test, wireless ad hoc network function test and system network management platform test, and then analysis of the test results.The test results show that this system has the characteristics of long communication distance, convenient deployment, flexible networking and so on. Which achieves the remote monitoring of high-voltage transmission line site environmental status, battery power and the monitoring of equipment running state. Finally this paper completes the system design requirements.